Hi all. Above vehicle drives fine but failed MOT on emissions. Very high CO at 10%, HC's at 600 ish, Lambda around 0.6-0.7

I pulled the gas analyser out.

No fault codes present.

Idle test results
manifold vac = 18.5-19.5 in Hg
fuel pressure = 2.15 bar
O2 sensor = 800-900mv constant
inj pulse = 3.7ms-4.5mS, 3.7mS most of the time
O2 integrator = -50

Fast idle test results
manifold vac = 20-21 in Hg
fuel pressure = 2 bar
O2 sensor = 800-900mv
inj pulse = 3.7mS
O2 integrator = -50

The O2 sensor will move down below 50mV if you open the throttle suddenly or give it an air leak, and the O2 sensor status does indicate the lean and rich mixture, but at a steady throttle position the mixture always stays on rich and 800-900mV. Basically the O2 sensor is telling the truth.

Going to try blanking the EVAP and probably check the cam timing during the week.